Concentrator.



A. R. WILFLEY.

ooNoENTRAToR. APPLICATION EILBD FEB. 3, 1912.

Patented May 19, 1914;

5 SHEETS-SHEET 1.

COLUMBIA PLANOGRAPH co..wAsHlNL`1ToN. DJG.

A. R. WILFLEY.

GONGENTRATOR.

APPLICATION FILED FEB. 3, 1912.

'Patented May y19,1914

5 SHEETS-SHEET 2.

k NR. MN

A. R. WILPLEY.

GONGENTRATOR.

APPLICATION FILED IBB. s, 1912.

1409"?,1 1 3, i Patented May 19, 1914.V

A. R.' WILFLBY.

GONCENTRATOR. APPLI'CATION FILED 1311.3, 1912.

1,0971 13, i Patented May 19, 1914.

5 SHEETS-SHEET 4.

COLUMBIA PLANOGRAPH col. WASHINGTON. D. c.

AfR. WILPLEY.

GONUENTRATOR.

APPLIUATJON FILED rnB.a,1912.

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armar man.

ARTHUR R. WILFLEY, OF DENVER, COLORADO.

CONCENTRATOR.

renatre.

To aZZ 'whom 'it may concern Be it known that l, ARTHUR R. YWinrrnr,citizen of the United States, residing in the city and county of Denverand State of Colorado, have invented certain new and useful improvementsin Concentrators; and l do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being` had to the accompanying drawings, and to the charactersot reterence marked thereon, which form a part of this specilication,

My invention relates to improvements in concentrators, of the generalconstruction set forth in my previous application, Serial No. 606,196,led February 2, 1911; now Patent No. 1,021,961, granted April 2, 1912-;and also my application Serial No. 656,318, tiled Ueteber 23, 1911, nowPatent No. 1,056,388, granted March 18, 1913.

ln my improved apparatus, tiltable tables are employed, each containinga plurality ot decks. These tables while at their upward limit otmovement are slightly inclined rearwardly, forming a sort of'pocket,whereby the pulp is caused to accumulate upon the decks of the tablesduring the early part of the treatment of the charge, provision beingmade for subsequently tilting the tables gradually at first and latermore abruptly. The final tilting movement coperates with an additionalsupply of water to discharge the concentrates from the tables.

ln my improved construction, the downward movement ot the tables, byvirtue ofl a suitable connection between a valve and the tables, opensthe valve to permit an additional supply of wash water to facilitate therapid removal of the concentrates while the table is at its downwardlimit of movement, or at its greatest inclination.

Another feat-ure ot novelty consists in the employment of a deiiectorcontrolled by a cam, which operates in harmony with another cam forcontrolling` the movement ot the tables. rlllie first named cam servesto actuate the deiector, whereby the pulp Vis directed upon the table asit is raised to its upward limit of movement, and cut ofi' from theother table.

Other features of novelty embraced in my present improvement. will'befully set forth in the detail description. Y

Having briefly outlined my improved con- Speccaton of Letters Patent.

Application led February 3, 1912.

Patented lliay 19, 1914.

Serial No. 675,302.

struction, I will proceed to describe the same in detail, referencebeing made to the aecompanying drawing, in which is illustrated anembodiment thereof.

ln this drawing: Figure 1 is a central vertical section taken throughthe apparatus on the line 1 1, Fig. 7 Fig. 2 is a detail view on alarger scale, illustrating a trough construction for supplying` water tothe tables, and showing` one of the automatically operated valvesemployed in connection therewith. This may be termed a section taken onthe line 2 2, Fig. 7, viewed in the direction of the arrow. Fig. 3 is asection taken on the line 8 3, Fig. 7, looking toward the left. Fig. -tis a detail view, illustrating the manner of pivotally mounting thetables. This is a view looking in the direction of arrow e, Fig. 5. Fig.5 is a section taken on the line 5 5, Fig. 3, the parts being shown on alarger scale. Fig. 6 is a section taken approximately on the line 6 6,Fig. 1. Fig. 7 is a top plan view ot the` apparatus with parts removed.It is also a section taken on the line 7 '7 Fig. 1, looking downwardly.Fig. 8 is a top plan view of t-he construction, partly in section, withparts removed from above for the purpose of more clearly illustratingthe manner of pivotally supporting the two table members.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a suitable frame work, which extendsupwardly and forms the support forr the mechanism for discharging pulpand wash water upon the tables. This apparatus includes two troughs 6,the said troughs .being supplied with water from a conduit 7, whichdischarges into a trough member 8 communieating with the troughs 6 bydiverging branches 9. Mounted above the water supply, troughs, orlaunderst, and arranged transversely thereof, are two bars 10, uponwhich rest the opposite ends kof a pulp detlector 12, which is V-shaped,in cross section and adapted to alternately feed the pulp to the twotable members 13, as hereinatter more fully described.

A pulp distributor 14 is mounted above the deflector, the distributerbeing Stationary. When the detlector is in the position shown at Fig. 1,viz., the farther toward the lett, the pulp from the discharge board, orplate 15, passes to the inclined surface 16 of the deflector, and thenceinto the subdivider 17, for carrying the pulp to the various decks 18 ofthe table farther toward the right, the said table being at its upwardlimit of movement and slightly rearwardly inclined, or tilted toward thelongitudinal center of the apparatus, whereby a quantity of pulp willaccumulate upon the various decks of the table before any can escapefrom the forward edges of the said decks. This accumulation of pulp uponthe table decks when the table is at its upward limit of movement, isindicated by dotted lines 19, in Fig. 1.

As illustrated in Fig. 1, the table 13, to-

ward the left, is at its downward limit of movement. New, when thistable member is raised, the deflector will be shifted from the full lineposition in Figs. 1 and 2, to the dotted line position in Fig. 3,whereby the pulp from the distributer will fall upon the oppositeinclined surface 2O of the deiiector, whereby the pulp will fall intothe sub-divider 17 of the table 13 farther to the left in Figs. 1 and 3.

The mechanism for accomplishing the shifting of the deflector, will nowbe described: An eccentric cam 21 is mounted on a longitudinallydisposed shaft 22 journaled at its opposite ends in the lower part ofthe frame work, as shown at 23. This shaft carries a fast gear 24 whichmeshes with a pinion 25 fast on a shaft 26, carrying a worm-wheel 27operated from a worm carried by a shaft 28, the last named shaft beingactuated by a cone pulley 29 engaging'- a pulley 30 fast on the sha-ft28. The cone pulley 29y is fast on a shaft 31, and is initially operatedby connecting a pulley 32 thereon with any suitable motor. Upon theshaft 22, and near opposite ends thereof, are located two cams 21, eachhaving a groove 33, which is engaged by a roller 34, pifvoted on thelower extremity of a relatively long lever 35, the latter beingfulcrumed intermediate its extremities, as shown at 36, the fulcrum pinpassing through the said lever and perforations formed in the bifurcatedextremity 37 of a bracket 3S, secured to the frame work, as shown at 39.The upper extremities of the two levers 35 are provided with slots 40,which are engaged by pins 41, with which the opposite extremities of thedeflector'12 are equipped. The slots 33 of thev cams 21, are so arrangedwith reference to the center of motion of the axis of the shaft 22, thatwhen the cam is inthe position shown in Fig. 3, the lower extremities ofthe levers 35 will be moved toward the left a.- sufli'cient distance tocause the deiector 12 to occupy the full line position in Figs. 1 and 3.This condition will continue while the. cams are making approximatelyonehalf of a. revolution, after which the Vantifiiictional rollers 34,will enter the other porvter 14 will be caused to fall on the oppositeinclined surface 20 of the deflector, and the pulp will be guided to thesub-divider 17 of the table member farther toward the left. (See Figs. land 3.)

The inclination of the tables is controlled vby levers 42, fulcrumed at43, and having anti-frictional rollers 44 engaging the irregularperipheral faces of cams 45, fast on the shaft 22. The lower extremitiesof the levers 42 are curved outwardly from the shaft 22, and areequipped with cups 46,

. adapted to receive the ball extremities 47 of rods 48, whose upperextremities 49 are The rods 48 are each combuckles 51, for convenienceof adjustment.

TWhen the cam 45 is in the position illusti'ated in F ig. 1*, the tableat the left is at its downward limit of movement, and the table at theright is at its upward limit of movement. .ln this event, the roller 44of the lever 42 farther toward the left engages a recess, or depression,52, formed in the face of the cam, the bottom of this depression beingthe point on the face of the cam nearest the axis of the shaft 22. Indescribing this operation, it is assumed that the cam 45 is traveling inthe direction of the arrow in Fig. 1. From an inspection of the cain itwill be understood that the roller 44 of the said lever, no soonerreaches the bottom of the recess 52, which recess occupies but a smallpart of the face of the cam, than it begins to leave said recess, beingquickly forced outwardly to a part of the cam considerably farther fromthe center of motion. 7h-ile the said roller is traveling from thebottom of the recess 52 to a point 53 on the face of the cam, the table13 on the left (see Fig. 1) will. be raised to its limit of upwardmovement, and will remain in this position while the cam is makingapproximately three-fourths of a revolution. In the meantime, however,the recess 52 of the cam, after having made approximately one-half ofr arevolution from the position illustrated in Fig. 1, will be in positionto allow t-he roller 44 of the opposite lever to enter the said recess,thus allowing the table toward the right to assume its greatest positionof inclinatien. It will thus be seen that both tables are foraconsiderable time simultaneously at their upward limit of movement.

. Vhen each table is at its upward limit of movement it receives waterfrom one of the troughs, or launders, 6 only, and this wash watermingles with the pulp during the period of stratification, so to speak,or while the separation of the concentrates is taking place, by settlingto the bottom of the quantity of pulp which has accumulated on thetable. During the time that the pulp is being fed to a table, when thelatter is at its upward limit of movementthe wash water from the conduit7 is cut olf from the table by means of an oscillating gate 54, pivotedat 55, its outer extremity at 56 being adapted to alternately engage theopposite side walls of the receptacle 8. The opposite end of this gateis slotted, as shown at 57, to receive an extension 58.0f one of thepins 41 of the deflector 12, the said pin having an upwardly projectingportion entering the bifurcated extremity 57 of the gate, hence, as thedellector is shifted toward the left, (see Fig. 1) to cause. the pulp toenter the sub-divider 17 of the right hand table, the gate 54 is shiftedto out off wash water from the right hand launder 6, which supplies theright hand table, allowing all of the water from the conduit 7 to passto the launder 6 which supplies the left hand table. At the same time,the left hand table, which is in the lowermost position, receives anadditional supply of wash water from an aux.

iliary launder 59, which is composed of two members 60, arrangedparallel with the launders 6, but farther from the longitudinal centerof the machine, the two launder mem bers 60 being connected at one endby a transverse member 61. This auxiliary launder 59 is constantlysupplied with wash water from a conduit 62 arranged at one end of one ofthe launder members 60. Each of the launder members 60 is provided withtwo valves 63 which control openings 64, forming communication betweenthe launder members 60 and the launders 6. These valves close bygravity, being of sufficient mass for the purpose. Each valve isconnected by means cfa link 65 with a lever 66, fulcrumed at G7, the armof the lever remote from the valve, being connected with one extremityof a chain 68, the opposite extremity of the chain being connected witha table member, Vas shown at 69. Normally, or when the table are attheir upward limit of movement, these valves are closed, whereby thewater from the auxiliary launder 59 is cut olf from the launders G.TWhen, however, either table is tilted, these valves 93 of the laundermember 60 on the side where the tilted table is located, are opened toallow the water from the launder 69 to enter the launder 6, whereby anincreased amount of wash water is discharged upon the decks of thetilted table to facilitate the removal ofthe concentrates therefrom.However, as soon as Ythe table has moved upwardly a short distance, thechains G8 slacken, and the valves 63 seat themselves by gravity, and cutolf the excess supply of wash water to the launder 6.

Each table is provided on each side with a plate 70, which is secured tothe table by means of bolts or other suitable fastening devices 71. Eachof these plates carries a conical journal 72, which engages a bearing 73 of counter-part shape, adjustably mounted on one extremity of a bar74, the said bar connecting the two tables, there being one of theseconnecting bars at each end of the table structure. The bearing member 73, includes a plate member 75, which is connected with the bar 74 bybolts 76, the said bolts passing through slots 77 formed in the bar; thebearing member 73 passes through a relatively large opening 7 S formedin the bar. By virtue of this construction, the bearings for thejournals 72 are adjustable longitudinally of the bar 74, which isnecessary or highly advantageous in assembling the structure.

A rod 79 passes between the two tables in a lengthwise direction andpasses through openings 80 formed in the centers of the two bars 71. Atone extremity, this rod is connectedwith the bar by a nut S1, while atits other extremity, the rod is threaded, as shown at V82, and extendsbeyond the bar, where it is connected vwith a ball cup member 83,cooperating with a similar member Sli, the two members 'being securedtogether by bolts S5 and forming a bearing for the ball extremity 86 ofa pitman 87 connected with a strap' 88 of 'an eccentric 89 mounted onthe shaft 81, which imparts the transverse vibration of reciprocatorymovement to the two table members. This movement is simultaneouslyimpartedr to both tables through the agency kof the rod 79. In order tomake the bars 71 connecting the two tables, as aforesaid, substantiallyrigid, the tables are reinforced on opposite sides of the tables at thecenter of each bar by blocks 90, which'iill the space between the barsand the tables, since the bars are held at some distance from the tablesby virtue of the bearing construction for their journals 72. a

The tables are movablysupported from underneath by elongated bearings91, formed on the frame work, the said bearings having grooveslength-wise of the bearings, in which are located removable blocks 92,secured in placevby bolts or other suitable fastening devices, 93; theseblocks are grooved to receive wearing members 94, which aresemi-cylindrical in shape andvopen at the top to receive elongatedprojections 95, which are formed integral with plates 95, secured to theunder surface of the lowermost Ydeck of each table, as shown at 97. Theywearing parts 94 are closed at their ends,

and the projections 95 fit closely therein, so that during thelongitudinal reciprocation of the tables, the wearing parts move withthe pro-jections. Attention is called to the fact that this constructionfor supplying the tables, acts in harmony with the journal bearingconstruction arranged at the ends of the tables, as heretoforedescribed. 1n other words, the axis of the journal 7 2, is coincidentwith the center of motion of the tables on the supporting structureunderneath, as heretofore described.

As illustrated in the drawing, provision is made for receiving thedischarge of the gangue and concentrates when the tables are tilted.This construction includes two troughs, or receptacles, arranged onopposite sides of the structure. The outer trough 98, on each side, isarranged to receive the concentrates, while the inner trough 99, isadapted to receive the gangue. rlhese two troughs virtually compose areceptacle divided into two compartments by a partition 100. Supportedby upwardly extending parts 101 and 102, is a stationary receptacle 103,provided at its bottom with a discharge nozzle 104:, upon which ispivotally mounted, as shown at 10G, a member 105, which is arranged tooscillate so as to discharge into either of the compartments 9S or 99,as may be desired. Each oscillating member 105, is pivotally connected,as shown at 107, with a relatively long arm 108, vwhich extends inwardlytoward the center of the machine, and is pivotally connected at itsinnerextremity, as shown at 109, with a lever arm, 110,V carrying a roller112 engaging an eccentric groove 113 in a cam 114, fast Von the shaft22. The upper extremity of the lever arm 110, is pivotally mounted onthek frame work, as shown at 115.

The construction of the cam 114 is such that during the operation of themachine, the oscillating member 105 is shifted to discharge theconcentrates from each tableinto the compartment 98, and to dischargethe gangue into compartment 99 on each side of the structure.

From the foregoing description, the use and operation of my improvedconstruction will be readily understood.

Assuming that the tables are in the relative position illustrated inFigs. 1 and 3, the operation may be described as follows: Theconcentrates have just been discharged from the left hand table, sincethe latter is at its downward limit of movement, the said concentratespassing into the concentrate compartment 98 while the table on theright, which is at its upward limit of movement has its rear side, orthat nearer the center of the structure, slightly below its outer ordischarge side, and by virtue of this .ar-

rangement, the pulp will accumulate on each Y deck of the table, asindicated by the dotted lines 19, until the depth is sufficient topermit an overflow at the discharge side of the decks. During thisaccumulation, the metallic values under the inliuence of the vibrationto which the table is subjected, as heretofore described, will settle onthe upper surface of the decks, while the gangue, or worthless material,will remain in suspension in the water, and as soon as the overflowcommences, the gangue only, will be discharged. This gangue dischargewill continue during the first or initial tilting movements of thetables; the gangue, however, is quickly discharged, since it is held insuspension by the water, and as the table continues its tilting action,the valves 63 in the auxiliary launder will be opened, whereby the waterfrom the auxiliary launder is allowed to enter the launder 6 on thecorrespending side of the machine, whereby an additional quantity ofwater will be discharged through the outlet pipes or chutes 116, whichlead from the perforations 117 in the bottom of each launder 6. Thisexcess of water cooperates with the inclination of the table to quicklyremove the concentrates from the decks of the latter, after which thetable by virtue of the cams 15 and the connections between the cams andthe table, as heretofore described, will be quickly raised to the normalposition, or that shown at the right in Figs. 1 and 3, whereby theaccumulation of pulp upon the various decks commences. Simultaneously.with the elevation of the table to its upward limit of movement, thedeflector 12 is automatically shifted through the instrumentality of thelever 35 and the cam 21, whereby the discharge of pulp from thedistributer will be cut olf from one table and discharged upon theother. Furthermore, as soon as the deflector is shifted from the fullline position to the dotted line position (see Fig. 3), whereby, thepulp is caused to discharge upon the left hand table, the gate 54 isautomatically actuated to cut olf the supply of water to the table onthe left, and direct the wash water to the table on the right, whereby,this water is utilized for separating the concentrates from the gangue,and inally in conjunction with the additional supply received from theauxiliary launder, serves to facilitate the discharge of theconcentrates from the table when the latter is tilted to the'desiredinclination, as heretofore explained. Y

1n further explanation of the operation of my improved construction, itmay be stated that the tables may be said to occupy three positions,viz., a rearward inclination and two forward inclinations. The rearwardinclination is occupied by the table during the greater portion of thetime, be-

ing the time during which the pulp is fed to the table, and while thestratiiicationof the material is taking place upon the table,

whereby the metallic values are caused to settle upon the concentrationfaces of the decks. During the rearward inclination of the table, or theposition of the latter when its side adjacent the center of the machineis lowermost, the mineral values under the influence of the longitudinalreciprocation, or vibratory movement of the table, not only settle uponthe faces of thedecks, but also travel rearwardly thereon, whereby whenthe table is given its initial forward inclination for the purpose ofremoving the gangue, the mineral values are so far in the rear that theyare prevented from escaping with the gangue.

Attention is called to the fact that the rear side of the table isclosed against the escape of either gangue or concentrates. After thematerial has been stratified upon the table during its rearwardinclination, as heretofore explained, and the feed of the pulp to thetable has been cut off, the table assumes its first position of forwardinclinat-ion, viz., during the time that the cam 45 is traveling fromthe po-int A to the point o B in contact with one of the rollers 44 of alever 42.A During this time the gangue is discharged from the table,sinceit is held in suspension by the water and readily escapes from theconcentrates which are heaviest and form an approximately solid mass indirect contact with the faces of the decks. After this discharge of thegangue, and during the time that the cam 45 is traveling from the pointB to the bottom of the recess 52 on the face of the cam in contact withone of the rollers 44, the table drops to its downward limit ofmovement, whereby it assumes its position of greatest inclination. It isduring this time that the excess of wash water, due to the opening ofthe valves 63 of the launder members 60, occurs, the increase of washwater coperating with the increased inclination of the table tofacilitate the discharge of the concentrates, the concentrate dischargebeing completed while the table is in its lowermost position, or itsposition of greatest inclination. As the cam 45 continues its movementin the direction of the arrow (see Fig. 1), it quickly travels incontact with o-ne of the rollers; 44 from the bottom of the recess 52 tothe oint 53 on the face of the cam, during which time the movement ofthe table just described has been reversed, and thelatter is returned toits position of rearward inclination, whichV position it retains whilethe cam 45 is traveling from the point 53 to the point A in contact withthe roller 44 of the lever 42, which regulates the position of the tablein question. When 'the rod 79 is applied to the bars 74,`and fastened bythe nut 81, the said bars are placed under tension by the Vapplicationnof the nut.

This feature, together `with the blocks 90, causes thev tabl/esto bereciprocated inperfect unison, since the force employed in impart-ingthe reciprocating movement is distributed throughout the entire lengthof the bars 74, the said bars being connected with the tables withreference to the center of gravityV of Vthe lat-ter, whose rear sides,or the sides adjacent the center of the machine, are heaviest.

VBy virtue of the construction described, for imparting the longitudinalreciprocation to the tables, the latter are maintained at all timesintheir normal operative positions, whereby all tendency to torsionalstrain, which would result from applying the power, in a lessadvantageous manner is overcome.

Having thus described my invention, what l claim, is:

l. The combination of a tiltable concentrating table, closed at its rearside and open at its opposite side for discharge purposes, and means forautomatically tilting the table for two positions of successivelygreater inclination in a forward direction for t-he purpose ofdischarging the gangue and concentrates, respectively, and in the ordernamed, and then reversing the tables movement, and finally tilting itrearwardly to permit the accumulation thereon of a charge of pulp, andmeans for supplying pulp to the table during the period of rearwardinclination, substantially as described.

2. The combination of a tiltable concentrating table, closed at itsrearward side and open at its opposite side for purposes of gangue andconcentrates discharge, means for automatically tilting the table to twopositions of successively greater inclination in a forward direction andthen reversing the tables movement, and finally tilting itv rearwardlyto permit the accumulation of a 'charge of pulp thereon, means forsupplying pulp during the period o-f rearward inclination, and means forcutting olf the pulp during the period of forward inclination,substantially as described.

3. The combination of a tilt-able concentrating table, closed at itsrear side and open at its opposite side for purposes of gangue andconcentrates discharge, means for automatically tilting the tableto twopositions of successively greater inclination in a forward direction,and then reversing the tables movement, and nally tilting it rearwardlyto permit the accumulation of a charge of pulp thereon, means forsupplying pulp during the period of rearward inclination, means forcutting olf the pulp during the period of forward inclination, andmeansffor supplying wash water during the period of forward inclination.

4. The combination of a tiltable concentrating table, closed at its rearside and open at its opposite side for purposes of gangue andconcentrates discharge, means for automatically tilting the table to twopositions of successively greater inclination in a. forward direction,and then reversing the tables movement, and finally tilting itrearwardly to permit t-he accumulation of 4a charge of pulp thereon,m-eans for supplying pulp during the period of rearward inclination,means forY cutting` off the pulp during the period of forwardinclination, means for supplying wash water during the period of forwardinclination, and means for cutting olf wash water during the period ofrearward inclination.

5. The combination of a tiltable concentrating table, closed at its rearside and open at its opposite side for discharge purposes, means fortilting the table to two positions of successively greater inclinationin a forwarddirection for discharging the gangue and concentrates,respectively, in the order named, and then reversing the tablesmovement, and finally tilting it rearwardly to permit the accumulationthereon of a charge of pulp, means for supplying pulp during the periodof rearward inclination, means for cutting off the pulp during theperiod of forward inclination, means for supplying wash water duringboth periods of forward inclination, and means for supplying anadditional volume of wash water during the period of greatestinclination.

6. The combination of a tiltable concentrating t-able, closed on itsrear side and open at its opposite side for discharge purposes, meansfor automatically tilting the table to positions of successively greaterinclination in a forward direction for the purpose of discharging thegangue and concentrates therefrom, in the order named, and thenreversing the tables tilting movement, and finally tilting it rearwardlyto permit the accumulation thereon of a charge of pulp, means forsupplying' pulp to the table during its period of rearward inclination,means for cutting off the supply of pulp from the table during theperiods of forward inclination, means for supplying wash water to thetable simultaneously with the cutting off of t-he pulp therefrom, andmeans for automatically increasing the supply of wash water during thelast period of forward inclination, for the purpose set forth.

7. The combination of a -tiltable concentrating table, closed at itsrear side and open at its opposite side for discharge purposes, meanslfor tilting the table longitudinally to positions of successivelygreater inclination in a forward direction, and then reversing thetables movement, and finally tilt-ing it longitudinally rearwardly topermit the accumulation thereon of a charge of pulp, and means forimparting a transverse reciprocating movement to the table.

8. The combination of a longitudinally tiltab-le concentrating table,closed at its rear side and open at its opposite side for purposes ofgangue and concentrates discharge, means connected with the table totilt the latter to a posit-ion of rearward inclination and to twopositions of successively forward inclination and maintain theinclinations for predetermined periods, means for supplying pulp duringthe period of rearward inclination and for cutting off of pulp duringthe period of forward inclination, and means for supplying wash waterduring the two periods of forward inclination.

9. The combination of a tiltable concentrating table, al cam havingthree faces, means connected with the table and bearing upon said cam,the faces of the cam being proportioned to tilt the table to a positionof rearward inclination, and two positions of successively greaterforward inclination and maintain the inclinations for predeterminedperiods, means for supplying pulp during the period of rearwardinclination and for cutting off the supply of pulp during the periods offorward inclination, and means for supplying wash water during the twoperiods of forward inclination.

10. The combination of a tiltable concentrating table, a cam havingthree faces, means connected to the table and bearing upon said cam, thefaces of the cam being proportioned to tilt the table to a position ofrearward inclination and two positions of successively greater forwardinclination and maintain the inclinations for predetermined periods,means for supplying pulp during the period of rearward inclination andfor cutting olf the supply of pulp during the two periods of forwardinclination, and means for supplying water during the two periods ofgreater inclination, the relative lengths of the three faces being suchthat the time during which the table is maintained in the position ofrearward inclination is relatively long, while the times during which itis maintained in the two positions of forward inclinations arerelatively short.` and approximately equal.

ll. The combination of a tiltable concentrating table, V'means connectedwith the table to tilt the latter to a position of rearward inclinationand two positions of successively greater forward inclination, andmaintain the inclinations for predetermined periods, means for supplyingthe pulp during the period of rearward inclination and for cutting offthe supply during the period of forward inclination, means for supplyingthe table with wash water during the two periods of forward inclination,and means connected with the table and acted on by the latter during itslast position of forward inclination for automatically increasing thesupply of wash water to the table, substan tially as described.

l2. The combination of a tiltable concentrating table, a cam havingthree faces, means connected with the table and bearing upon said cam,the faces of the cam being proportioned to tilt the table to a positionof rearward inclination and two positions of successively greaterforward inclination, the faces of the cam varying in length, and theirrelative lengths being such that the table is maintained in the firstposition relatively long, and in the second and lthird positionsrelatively short, lmeans for supplying pulp during the period ofrearward inclination, means for cutting off the supply during theperiods of greater inclination and means for supplying water during twoperiods of forward inclination.

13. The combination of a tiltable concentrating table, closed at itsrear side and open at its opposite side for purposes of gangue andconcentrates discharge, a cam having three faces, a connection betweenthe cam and the table, the faces of the cam being proportioned to tiltthe table to a position of rearward inclination and two positions ofsuccessively greater inclination and main tain the inclinations forpredetermined periods, and having actuating means timed to harmonizewith the tilting means for supplying pulp to the table .during theperiod of rearward inclination, and for cutting off the supply duringthe periods of forward inclination, and means for supplying wash waterduring the periods of forward inclination.

In testimony whereof I aHiX my signature in presence of two witnesses.

ARTHUR R. WILFLE Y.

lVitnesses:

A. J. OBRIEN, A. EBERT OBRIEN.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

